Overall Dimensions â High School. High School Overall football field dimensions are as follows: Length: 360 feet or 120 yards. Width: 160 feet or 53 1/3 yards. End Zone: High School end zones are 10 yards deep. End Line: A six foot end line border marks the back of the end zone. Field Numbers: Sideline field numbers are 6 foot high by 4 foot wide designating each 10 yard line marker.
1 On average, dogs have two cycles a year. 2  The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. 3  The estrus period length varies widely between breeds and individual dogs. 4  The length of a cycle varies widely, even for dogs of the same breed.
Timing. Your dog can come into her first heat any time between 6 and 24 months. According to Webvet.com, small dogs come into heat sooner than larger breeds. Typically she will have two estrus cycles, or heats, a year, and each one lasts for between 18 to 24 days.She is likely to show signs that her heat is about to start by changes in her behavior.leeding Stage. The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time.